Which is not a function of the cytoskeleton?

Correct Answer: right ventricle, pulmonary artery, and left atrium

Explanation:

Right ventricle (which pumps blood to the lungs), pulmonary artery (which carries blood to the lungs), and left atrium (which receives blood from the lungs) are involved directly in pulmonary circulation.

Correct Answer: double fertilization

Explanation:

In flowering plants one sperm nucleus fertilizes the egg and the other sperm nucleus fuses with two other nuclei found within the ovule, thus forming triploid endosperm.

 

Hence, double fertilization is unique to flowering plants.

Correct Answer: Evolution

Explanation:

Heritable variation is one of the four most important factors that affect whether natural selection can occur. These factors include

1) Heritable variation

2) Descent with modification

3) Struggle for survival, and necessarily if the others are satisfied

4) Survival of the fittest.

Heritable variation allows for possibly beneficial, negative, or even neutral mutations to get filtered during each generation by natural selection--weeding out negative mutations, passing on positive and neutral ones. Without heritable variation, species would quickly fall victim to parasites who take advantage of identical genetic material in a population and evolution would not occur.

Variation is the raw material of evolution.

Correct Answer: Axons make up a majority of the matter in a nerve.

Explanation:

Axons make up a majority of the matter in a nerve is the one statement regarding nerves is incorrect.

Correct Answer: They have a hydrogen at the 3? carbon of the sugar.

Explanation:

ddNTPs - Dideoxynucleotides and abbreviated as ddNTPs.

 

They are chain-elongating inhibitors of DNA polymerase, used in the Sanger method for DNA sequencing.

 

They have a hydrogen at the 3? carbon of the ribose sugar.

Correct Answer: Eubacteria

Explanation:

There are two kingdoms of bacteria. They are

1. Eubacteria  and 

2. Archaea

 

The members of these two kingdoms appear similar in shape and appearance, even under the extreme magnification of the electron microscope . However, they are very different from each other in a number of molecular and biochemical aspects. It is these differences that have resulted in the microorganisms being grouped into separate kingdoms.

 

For example, eubacteria contain the rigid, stress-bearing network known as the peptidoglycan . The only exceptions are the bacteria from the genera Mycoplasma and Chlamydia. Archaebacteria do not contain peptidoglycan. Instead, they contain a different structure that is called pseudomurein.

 

The common bacteria belongs to Eubacteria kingdom.

Correct Answer: Yeast belongs to members of the Kingdom Fungi Yeast are single-celled microorganisms that are classified, along with molds and mushrooms in Fungi family Yeasts are evolutionally diverse and are therefore classified into two separate phyla, Ascomycota or sac fungi and Basidiomycota or higher fungi, that together form the subkingdom Dikarya

Correct Answer: Nucleotides

Explanation:

DNA is a very long chain polymer made up of thousands of repeating units called nucleotides.

 

Nucleotide Unit is composed of a phosphate group, a pentose sugar, and a nitrogenous base.

 

The sides of the DNA ladder are made up of alternating deoxyribose sugar -- phosphate group units.

Correct Answer: Uracil

Explanation:

A nitrogenous base, or nitrogen-containing base, is an organic molecule with a nitrogen atom that has the chemical properties of a base. The main biological function of a nitrogenous base is to bond nucleic acids together. A nitrogenous base owes its basic properties to the lone pair of electrons of a nitrogen atom.

 

In DNA, four bases have been found. They are

1. Adenine (A),

2. Guanine (G),

3. Cytosine (C) and

4. Thymine (T).

 

The first three of these bases are found in RNA also but the fourth which is Uracil (U) is absent in it.

RNA contains cytosine and uracil as pyrimidine bases while DNA has cytosine and thymine.

Correct Answer: Cytoplasm

Explanation:

Translation occurs in the cytoplasm whereas transcription occurs in the nucleus.

 

Transcription and Translation:

Terms transcription and translation in biology are generally related to the DNA and its properties. Human cells replicate. In order to do that, they have to produce the same constituents for the new cell that is to be made. The only way to do that is by producing proteins.

 

The proteins are produced in the process that is called protein synthesis. The first step is in the nucleus where a particular gene is being expressed so it enables all protein factors to come and to replicate that part of a chromosome. This is finished when mRNA, the same single-stranded genetic code of a particular gene, is formed. This is transcription.

Right after that, the mRNA enters the cytoplasm through nuclear pores. There, it could be translated into proteins by ribosomes. This process is called translation.