The paper clip, which is denser than water, floats on the surface because of water's surface tension. Surface tension is a property of water that is the result of polar water molecules sticking together or water's property of A) adhesion. B) cohesion. C) buoyancy. D) capillary action.

QUESTION POSTED AT 06/12/2019 - 02:07 PM

Answered by admin AT 06/12/2019 - 02:07 PM

The answer is cohesion. The high surface tension helps the paper clip (with much higher density) float on water. The property of a liquid that allows it to resist an external force, due to cohesive nature of its molecules. Cohesion refers to the attraction of molecules for molecules of the same kind. Water molecules have strong cohesive forces due to their ability to form hydrogen bond with each other.
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Related questions

In Klinefelter syndrome males have chromosomes XXY. This is an example of: a.Non-disjunction of sex chromosomes b.Crossing over c,Chromosomal rearrangement

A, Non-disjunction of sex chromosomes. I thinks this might be the right answer. Not sure though......

ANSWERED AT 20/01/2020 - 01:48 PM


QUESTION POSTED AT 20/01/2020 - 01:48 PM

What is the best explanation for the process of transpiration in plants? A. It is the evaporation of water from leaf stomata, which helps in xylem transport. B. It is the condensation of water droplets on leaf surfaces, which helps in phloem transport. C. It is the property of water molecules to adhere to the xylem wall while traveling against gravity.

Answer:

Option A, t is the evaporation of water from leaf stomata, which helps in xylem transport.

Explanation:

Transpiration is the process in which water is taken up by the plants from the roots and then it is transported to the leaves and then released to the atmosphere. The leaves have stomata at their bottom , which opens up and release the water in the form of vapour. In Xylem transport , water is transported from the roots to all part of the plant body, since water transportation is involved in transpiration process , it is said to be helping in xylem transport.

Thus, option A is the correct answer.

ANSWERED AT 20/01/2020 - 01:46 PM


QUESTION POSTED AT 20/01/2020 - 01:46 PM

What percentage of the energy flowing through primary producers is ultimately transferred to secondary consumers? a. 100% b. 10% c. 1% d. 0.1%

C.1%, Only 10% of the energy will be transferred to the next consumer, in this case 10% of the energy from the producer will be transferred to the primary consumer and 10% from the primary consumer will be transferred to the secondary consumer. That makes it 1% from the energy in the primary producers will be transferred to the secondary consumer. 

ANSWERED AT 20/01/2020 - 01:46 PM


QUESTION POSTED AT 20/01/2020 - 01:46 PM

Members of Porifera are diploblastic. Which statement clarifies this? A. They are unsegmented. B. They have a true body cavity. C. They have two germ layers.

Option c. They have two germ layers (diploblastic)

ANSWERED AT 20/01/2020 - 01:45 PM


QUESTION POSTED AT 20/01/2020 - 01:45 PM

Which level of consumer has access to the smallest supply of energy? a. primary b. secondary c. tertiary d. quaternary

D. Only 10% of the energy will be passed from producers to consumers. In this case, quaternary consumers will receive the least amount of energy from producers.

ANSWERED AT 20/01/2020 - 01:44 PM


QUESTION POSTED AT 20/01/2020 - 01:44 PM

The triplet code can produce 64 possible codon combinations. What is an advantage of this? A. Every single codon specifies more than one amino acid. / B. Every single amino acid has more than one codon. / C. The first two bases of the codon specify the amino acid.

The answer is B. Every single amino acid has more than one codon.


There are 20 different amino acids, but there are more than 20 combinations of three nucleotide bases on DNA. There are 64 different combinations of three nucleotide bases on DNA, which is about 3 times more than the number of amino acids. Therefore, every single amino acid has more than one codon is the right answer. But, it should be taken into consideration, that 2 out of 20 different amino acids have only one codon - methionine and tryptophan.

ANSWERED AT 20/01/2020 - 01:42 PM


QUESTION POSTED AT 20/01/2020 - 01:42 PM

What aspect of chaparral shrubs is both a part of their natural defenses and the reason many are popular in cooking? a. aromatic oils b. small evergreen leaves c. ability to thrive in nutrient-poor soil d. seed germination after fires

The aspect of chaparral shrubs that us both a part of their natural defenses and the reason many are popular in cooking is their aromatic oils. The correct answer is option A. The aromatic oils of the chaparral shrubs as their natural defense is when during hot days, these aromatic oils evaporate in the air to cool off the leaves and preventing other plants nearby to grow. In addition, these oils also prevent herbivores from eating the shrubs.

ANSWERED AT 20/01/2020 - 01:40 PM


QUESTION POSTED AT 20/01/2020 - 01:40 PM

Two important steps involved in genetic engineering are cutting the desired gene from its genome, then cutting the vector genome and pasting the gene into it. How is this carried out? Select one of the options below as your answer: A.Using the same restriction enzyme for cutting the desired gene and the vector and using ligase for pasting the gene into the vector B.Using two different restriction enzymes for cutting the desired gene and the vector and polymerase for pasting the gene into the vector C. Using the same ligase for cutting the desired gene and the vector and a restriction

The correct answer is A. Using the same restriction enzyme for cutting the desired gene and the vector and using ligase for pasting the gene into the vector. Vectors ensure DNA replication in cells. Restriction enzymes slice the DNA in specific sites; it should be the same so as the two ends will easily complement back together. 

ANSWERED AT 20/01/2020 - 01:40 PM


QUESTION POSTED AT 20/01/2020 - 01:40 PM

Which of the following is a property of the stem of a dicot plant?Select one of the options below as your answer:A. ground tissue is differentiated into pith and cortexB. vascular bundles are arranged sporadicallyC. no cambium between the xylem and phloem

The statement that describes about the property of the stem of a dicot plant is that, the ground tissue is differentiated into pith and cortex. The correct answer is option A. The vascular bundles are about the same size and are cojoint, collateral and open. 

ANSWERED AT 20/01/2020 - 01:39 PM


QUESTION POSTED AT 20/01/2020 - 01:39 PM

Henry eats rice for lunch, which contains starch. Which enzyme catalyzes the reaction that takes place and which product is the result of this reaction? Amylase catalyzes the reaction; glucose is the product Pepsin catalyzes the reaction; lactase is the product Lactate dehydrogenase catalyzes the reaction; lactate is the product

Answer:

Amylase catalyzes the reaction; glucose is the product

Explanation:

In the process of digestion, polysaccharides like starch are broken down into monosaccharides before being absorbed. Digestion of starch is catalysed by amylase enzymes which are salivary amylase and pancreatic amylase. Salivary amylase begins digestion of starch inside mouth during chewing process. The digestion is further carried out by pancreatic amylase in small intestine. The starch is hydrolysed in digestion process and the products are glucose, maltose, maltotriose and α-dextrins. Disaccharides like maltose are further converted into monosaccharides by enzymes like maltase which are present in brush border of small intestinal cells.

ANSWERED AT 20/01/2020 - 01:39 PM


QUESTION POSTED AT 20/01/2020 - 01:39 PM

Urine produced in the kidneys is carried to the bladder through a pair of tubes called _____.Select one of the options below as your answer: A. Urethra B. Ureters C. Nephrons

enters kindeys,then urine is filterd by nephrones, then bladder, then excreted by urethra 

ANSWERED AT 20/01/2020 - 01:38 PM


QUESTION POSTED AT 20/01/2020 - 01:38 PM

A conservation easement would be best suited to offset which of the following threats to biodiversity? A. overharvesting/ B. habitat degradation / C. exotic species / D. habitat loss

Answer: D. habitat loss

Explanation:

A conservation easement can be define as a legal agreement signed between a landowner and the government firm that permanently restricts the utilization of some part of land in order to conserve and protect the land to preserve it's biodiversity. The habitat loss is the correct option which can be offset by the conservation easement because it preserves the habitats of the species mainly present in such location.

ANSWERED AT 20/01/2020 - 01:36 PM


QUESTION POSTED AT 20/01/2020 - 01:36 PM

What observation led researchers to propose that chloroplasts evolved from cyanobacteria? A) Both produce proteins. B) Both contain mitochondria. C) Both provide structure to cells. D) Both perform photosynthesis.

(D) Both perform photosynthesis is the observation that led researchers to propose that chloroplasts evolved from cyanobacteria.
Chloroplasts is the area where photosynthesis takes place. It is a green organelle in a plant cell. Pigments called the chloros in a chlorophyll are needed for the photosynthesis.
Cyanobacteria or blue-gree algae contains a blue photosynthetic pigment and a chlorophyll for photosynthesis.

ANSWERED AT 20/01/2020 - 01:35 PM


QUESTION POSTED AT 20/01/2020 - 01:35 PM

Proteins that tag pathogens for destruction by immune cells are called A. antibodies. B. antigens. C. histamines. D. interferons.

Answer: Antigen

The antigen are proteins in the cells of the body.Out of over 100 different antigens that have been identified, there are six that have been shown to be the most important in organ transplantation. Of these six antigens, we inherit three from each parent. It is rare to get a six-antigen match between two people, especially if they are unrelated. HLA(human leucocyte antigen) typing is done before the transplant to ensure high probability of success.

A person can make antibodies against another person’s HLA antigens.  If a recipient has strong antibodies against a donor’s HLA, the risk of rejection is high and a donor would be declined for that recipient. so the type of antigens are tested for the compatibility before a transplant to ensure high probability of success and lower the rate of rejection.

Read more on Brainly.com - brainly.com/question/9765225#readmore

ANSWERED AT 20/01/2020 - 01:32 PM


QUESTION POSTED AT 20/01/2020 - 01:32 PM

Sucrose is made of which simple sugars? A. glucose and fructose/ B. fructose and galactose /C. galactose and cellulose /E. cellulose and glucose

Answer: A) glucose and fructose

Explanation:

ANSWERED AT 20/01/2020 - 01:30 PM


QUESTION POSTED AT 20/01/2020 - 01:30 PM

Lisa is interested in studying the chemical processes in living organisms. In which field of biology should she pursue her studies? A. Biophysics B. Biochemistry C. Biometry

B is the correct answer. Biochemistry is the field of studying chemical processes in living organisms. Biochemistry explains life processes very successfully, and, as a result, almost all of the life sciences involve biochemical research and/or research findings to some degree.

ANSWERED AT 20/01/2020 - 01:29 PM


QUESTION POSTED AT 20/01/2020 - 01:29 PM

Which one of the following is an example of a eukaryote? A) E. Coli Bacteria B) Virus C) Yeast

Yeast is an example of Eukaryote. 
Here are the description of Eukaryotes
They have membrane bound nucleus/Primitive nucleus.
They have Membrane bound Organelles like mitochondria, chloroplast and they have larger ribosomes than prokaryotes.

ANSWERED AT 20/01/2020 - 01:28 PM


QUESTION POSTED AT 20/01/2020 - 01:28 PM

A researcher while working in vitro (outside cell) added helicase enzyme which resulted in the untwisting of the DNA helix. But this untwisting led to strain ahead of the replication fork. Which enzyme can be added to correct this problem? Nuclease Topoisomerase Telomerase

The answer is Topoisomerase.

Topoisomerase is an enzyme with the role to regulate the overtwisting or undertwisting of DNA helix. If DNA helix is untwisted, topoisomerases will regulate this situation and will twist DNA helix.

Nuclease is an enzyme that cleaves the sequences of nucleic acids into smaller units.
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ANSWERED AT 20/01/2020 - 01:27 PM


QUESTION POSTED AT 20/01/2020 - 01:27 PM

Which of the following provides the best example of how comparative embryology supports the theory of evolution? A. Humans do not lay eggs as birds do, but birds produce yolk sacs instead of embryos, suggesting birds evolved later than humans. / B. Humans have a tailbone that is not visible during embryonic development, which suggests that humans evolved to not depend on their tailbone serving a useful purpose. / C. Humans do not have gills as fish do, but human embryos have gill slits, suggesting humans and fish share a common evolutionary ancestor. / D. Humans have embryonic cells that dev

Humans do not have gills as fish do, but human embryos have gill slits, suggesting humans and fish share a common evolutionary ancestor and this statement among the following statements provide the best example of how comparative embryology supports the theory of evolution. The correct option among all the options that are given in the question is option "C".

ANSWERED AT 20/01/2020 - 01:27 PM


QUESTION POSTED AT 20/01/2020 - 01:27 PM

#1. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. stromatolites. D. prokaryotes. #2. The greenhouse effect is related to the phenomenon of an increase in average surface temperature known as A. air pollution. B. agricultural improvement. C. global warming. D. conservation. #3. Which colorless and odorless gas, produced by radioactive decay of Uranium-238, is considered to be a cancer-causing agent? A. Oxygen B. Hydrogen C. Boron D. Radon.#4. Scientists can determine if oxygen existed in Earth's Archean atmosphere by A. determining how many people survived. B. looking for oxidized iron in rocks. C. looking at the amount of salt content in rocks. D. determining the lack of oxidation that occurred.

The correct answer for question number 1 is A - eukaryotes are the name for unicellular organisms that dominated earth up to the Precambrian times.

The correct answer for question number 2 is C - the greenhouse effect is related to the phenomenon of an increase in average surface temperature known as global warming.

The correct answer for question number 3 is D - the colourless and odourless gas that is produced by the radioactive decay of Uranium-238 and is considered to be a cancer-causing agent is Radon.

The correct answer for question number 4 is B - Scientists can determine if oxygen existed in Earth's Archean atmosphere by looking for oxidized iron in rocks.

ANSWERED AT 20/01/2020 - 01:27 PM


QUESTION POSTED AT 20/01/2020 - 01:27 PM

Looking through a microscope, you see a cell forming a cell plate during cytokinesis. Which cell are you looking at? A. Human nerve cell B. Epithelial cell of a dog C. Xylem cell of a rose bush

Cell plate being form would mean that a cell wall would be forming and as such the answer would be ... Xylem cell of a rose bush.

ANSWERED AT 20/01/2020 - 01:25 PM


QUESTION POSTED AT 20/01/2020 - 01:25 PM

The cell membrane controls the traffic of molecules into and out of the cell, prevents the entry of toxic material into the cell and permits selective uptake of nutrients. Which property of the membrane can this be attributed to? A) Carbohydrates present on the membrane B) Lipid bilayer of the membrane C) Membrane fluidity D) Semi-permeable nature of the membrane

Answer:

Semi-permeable nature of the membrane.

Explanation:

The semi-permeable nature of the membrane allows it to selectively allow some molecules to pass through the membrane while preventing others.

This is beneficial as this inhibits the toxic materials from passing through the cell and only allows molecules of up to a certain size to pass through.

The membrane is made up of proteins, phospholipids, and carbohydrates. This unique composition of the membrane only allows small molecules such as carbon dioxide and oxygen to pass through.

ANSWERED AT 20/01/2020 - 01:25 PM


QUESTION POSTED AT 20/01/2020 - 01:25 PM

What leads to long-term immunity in mammals? A. Exposure to an antigen B. Action of an antibody C. Barriers

Exposure to antigen as this input brings the total to five answers. y or n

ANSWERED AT 20/01/2020 - 01:24 PM


QUESTION POSTED AT 20/01/2020 - 01:24 PM

Christy notices that a certain kind of moth flies to the light on her porch. Which behavior is the moth exhibiting? A. Taxis B. Migration C. Imitation

The answer is A. taxis.
Taxis because moth are attracted to light that's why they are coming closer to it. Taxis is a behavior that directs them to a certain thing that they get attracted.

ANSWERED AT 20/01/2020 - 01:24 PM


QUESTION POSTED AT 20/01/2020 - 01:24 PM