A biologist is studying a structure that is made up of two layers of phospholipids. What is she most likely studying? DNA molecules cell membranes fats wax

QUESTION POSTED AT 18/01/2020 - 04:41 AM

Answered by admin AT 18/01/2020 - 04:41 AM

She is studying CELL MEMBRANES which consist of a lipid bilayer and may consist of a third outer layer of cell markers in the form of carbohydrate chains that attach to protein to form glycoprotein or attach to the lipid to form glycolipid.
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Related questions

Phosphorous is an important component in which of the following? A) ATP B) DNA C) both A and B D) neither A nor B

Atp is the answer..............

ANSWERED AT 24/02/2020 - 12:37 AM

QUESTION POSTED AT 24/02/2020 - 12:37 AM

The mineral particles found in the layers of a soil, including the topsoil and subsoil layers, were originally weathered from

Acid rain. The rain would have weakened the soil.

ANSWERED AT 24/02/2020 - 12:35 AM

QUESTION POSTED AT 24/02/2020 - 12:35 AM

Letter D is the part of the cell that makes proteins. What is letter D? A) ribosomes B) chromosomes C) chloroplast

the answer is A.RIBOSOMES

ANSWERED AT 24/02/2020 - 12:27 AM

QUESTION POSTED AT 24/02/2020 - 12:27 AM

Which of the following is a good example of something a cell might do during G1 phase

Well you didnt put your answer choices but the examples are: Cell grows and develops and new proteins are made

ANSWERED AT 24/02/2020 - 12:16 AM

QUESTION POSTED AT 24/02/2020 - 12:16 AM

Why do saturated fatty acids have straight structures, while unsaturated fatty acids have bent structures? A.Saturated fatty acids contain more carbon atoms. B.Saturated fatty acids contain many more bonds. C.Saturated fatty acids have single carbon-to-carbon bonds. D.Saturated fatty acids have a larger mass.

Unsturated Fatty Acids have Structures - Option C

Saturated fatty acids have single carbon-to-carbon bonds. Saturated fatty acids are the fatty acids which contains only single bonds and the unsaturated fatty acids are those which has double or triple bonds. Fatty acids are made of long chains of carbons.

Therefore, saturated fatty acids have straight structures while unsaturated fatty acids have bent structures. Saturated fatty acids are solid at room temperature and unsaturated fatty acids are liquid at room temperature. Ghee is an example of saturated fatty acids and oil is an example of unsaturated fatty acids.

ANSWERED AT 24/02/2020 - 12:14 AM

QUESTION POSTED AT 24/02/2020 - 12:14 AM

____ is a layer of organic sediment. a. Peat c. Lignite b. Bituminous coal d. Anthracite coal

A.Peat organic matter which causes decaying matter 

ANSWERED AT 24/02/2020 - 12:11 AM

QUESTION POSTED AT 24/02/2020 - 12:11 AM

What kind of molecule is represented in the diagram? A.A polysaccharide B.A nucleic acid C.A nucleotide D.A triglyceride

Correct answer: D). Triglyceride

Triglycerides are the fats that we get from the food we eat and it is carried in our blood. The fat we eat in a diet are butter, oils etc all are in triglycerides form.

Triglycerides are made up of glycerol and three molecules of fatty acid. These cannot be passed directly through the cell membrane, so lipases are the enzyme, which is used to break them in fatty acid and glycerol. These broken and simpler component are easily taken by the cell.

ANSWERED AT 24/02/2020 - 12:09 AM

QUESTION POSTED AT 24/02/2020 - 12:09 AM

Chromosome is to DNA as hour is to what?

Chromosome is to DNA as hour is to minute.

ANSWERED AT 24/02/2020 - 12:07 AM

QUESTION POSTED AT 24/02/2020 - 12:07 AM

Both astrology and astronomy study the stars. The major difference in the two is that

Astronomy is the study of space science in general, and astrology is the study of the MOVEMENTS of celestial objects only, also the movements of them compared to Earth.

ANSWERED AT 24/02/2020 - 12:00 AM

QUESTION POSTED AT 24/02/2020 - 12:00 AM

Muscle cells have many mitochondria for A) energy. B) protection. C) divisibility. D) reproduction

A) Energy could be the answer.

ANSWERED AT 23/02/2020 - 11:58 PM

QUESTION POSTED AT 23/02/2020 - 11:58 PM

Why did the invention of pcr make dna fingerprinting possible


With the invention of the PCR technique , DNA profiling took huge strides forward in both discriminating power and the ability to recover information from very small or degraded starting samples.

The process of PCR mimics the biological process of DNA replication but confines it to specific DNA sequences of interest.

In PCR process , the DNA sample is denatured into separate individual polynucleotide strands through heating. Two oligonucleotide DNA primers are used to hybridise to two corresponding nearby sites on opposite DNA strands. Thus two new copies of the sequences of interest are generated.

Repeated denaturation , hybridisation and extension in this fashion produce an exponentially growing number of copies of the DNA of interest.

Quantitative PCR methods enable automated , precise and high - throughput measurements.

ANSWERED AT 23/02/2020 - 11:50 PM

QUESTION POSTED AT 23/02/2020 - 11:50 PM

Many people try to eliminate fat from their diets. Which is one reason it is necessary for humans to eat fat? A.The internal organs are cushioned by fat. B.Eating fat is the fastest way to get energy. C.Fat stores less energy than polysaccharides. D.Saturated fats clear out the blood vessels.


A.The internal organs are cushioned by fat.


-Most of the nutrients in food fall into three major groups: proteins, fats, and carbohydrates. The body uses fat as a fuel source, and fat is the major storage form of energy in the body.By supplying energy, fats save proteins from being used for energy and allow them to perform their more important role of building and repairing tissues.

Fat also has many other important functions in the body, and a moderate amount is needed in the diet for good health.They also cushion internal organs, provide insulation against temperature and also facilitate absorption of fat soluble vitamins.

ANSWERED AT 23/02/2020 - 11:45 PM

QUESTION POSTED AT 23/02/2020 - 11:45 PM

Humans cannot digest food without the aid of small single-celled organisms that live in our digestive tract. These small organisms help humans digest food by breaking down complex food molecules. Which common name is associated with these single-celled organisms that help humans digest food? A) algae B) bacteria C) protozoa D) virus

Bacteria are single-celled organisms that help humans digest food.


The symbiotic association of bacteria and human is of importance in the process of digestion. These bacterias are found in our gut, large intestine and sometimes in small intestine also. These bacteria break down big molecules into useful forms. Bacteria are also responsible for producing vitamin k2 and vitamin B in large intestine. They also help in mobilising of xenobiotics, bile and sterols.

ANSWERED AT 23/02/2020 - 11:32 PM

QUESTION POSTED AT 23/02/2020 - 11:32 PM

Use the Amino Acid Chart on this page to answer the questions below. Transcription – Translation (transcribe to mRNA, then decode for amino acids) DNA: TAC GCG AAT ATC a A) START – Lysine – Leucine – Glycine b B) START – Arginine – Leucine – STOP c C) START – Serine – Cysteine – Phenylalanine – STOP d D) Methionine – Lysine – Leucine – STOP

The right answer is B) START – Arginine – Leucine – STOP .

RNA transcribed from this DNA consists of:  AUC - CGC - UUA - UAG.

AUC is the start codon.

CGC codes for Arginine.

UAA codes for Leucine.

UAG is a one of the stop codons.

The genetic code is the set of rules for translating the information contained in the genome of living cells in order to synthesize proteins. In a broad sense, it establishes the correspondence between the genotype and the phenotype of an organism. This code is based in particular on the correspondence between, on the one hand, the nucleotide triplets, called codons, on the messenger RNA and, on the other hand, the proteinigenic amino acids incorporated in the proteins synthesized during the translation phase of messenger RNA by ribosomes.

ANSWERED AT 23/02/2020 - 11:32 PM

QUESTION POSTED AT 23/02/2020 - 11:32 PM

How has the nucleus in cells evolved?

Common parts of a cell

The cell is the building block of an organism, its smallest living unit. By definition, all cells have the following:

A cell membrane: As a barrier between the cell and its environment, the membrane provides structure, protection and control over the movement of materials in and out of the cell.Cytoplasm: This refers to the contents of the cell membrane excepting the nucleus. One of its main components is cytosol, a jelly-like substance which acts as protection and support for the remaining contents.DNA: Each cell contains genetic material. However, the way it is stored is one of the distinguishing factors between a eukaryote (a plant or animal cell for example) and a prokaryote (like a bacterium). These represent the two main types of cells. The former has a nucleus — for its DNA — as well as other organelles while the latter does not. Organelles are parts of a cell that have a specialised function and their own membranes.Nucleus

ANSWERED AT 23/02/2020 - 11:26 PM

QUESTION POSTED AT 23/02/2020 - 11:26 PM

Describe the structure and major components of a nucletoide?

An example of a nucletoide is An DNA nucletoide which consists of a Nitrogen base, a five-carbon sugar (deoxyribose), and a phosphate group. 
in this DNA example there are four different types of nucletoide (
adenine, thymine, cytosine, and guanine).
Hope this helps

ANSWERED AT 23/02/2020 - 11:24 PM

QUESTION POSTED AT 23/02/2020 - 11:24 PM

Biological catalyst hormones and receptor molecules are similar in what way

They interact with each other using a high pH 2 they interact with molecules that can alter their specific bonding patterns and they contain amino acids chains that fold into a specific shape

ANSWERED AT 23/02/2020 - 11:24 PM

QUESTION POSTED AT 23/02/2020 - 11:24 PM

Which of these statements best sums up evolution? rapid change in species’ habits and features punctuated change in a population change in a population through new species being made change in a population through genetic variation over time


-Change in a population through genetic variation over time.


-Evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. It is the process of genetic change from one generation to the next and may be caused by several aspects including mutation, natural selection, genetic drift, thought and technology.

ANSWERED AT 23/02/2020 - 11:12 PM

QUESTION POSTED AT 23/02/2020 - 11:12 PM

Which statement is NOT true concerning the cytoskeleton of the cell?

It would be c hope this helps

ANSWERED AT 23/02/2020 - 11:06 PM

QUESTION POSTED AT 23/02/2020 - 11:06 PM

Which beatbox describes the relationship between dna, genes, and chromosomes?

Chromosomes are made from DNA. Genes are short sections of DNA. Genetically identical cells are produced by a type of cell division called mitosis. In sexual reproduction, a male gamete fuses with a female gamete to produce a new cell. This is called fertilisation. Gametes are produced by a type of cell division called meiosis. They contain a single set of chromosomes, whereas body cells contain two sets of chromosomes.

ANSWERED AT 23/02/2020 - 03:00 AM

QUESTION POSTED AT 23/02/2020 - 03:00 AM

How many chromosomes does each cell have?

In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46. Twenty-two of these pairs, called autosomes, look the same in both males and females. The 23rd pair, the sex chromosomes, differ between males and females

ANSWERED AT 23/02/2020 - 02:57 AM

QUESTION POSTED AT 23/02/2020 - 02:57 AM