If an enzyme is absent during polypeptide production, a mutation can occur. a. True
b. False

Answers

Answer 1
Answer: True. Protein enzymes are necessary to break polypeptide bonds. If they are absent within the cell mutations and abnormal cell growth would occur. Enzymes play a crucial role in balancing the cell's nutrients and overall processing of these nutrients that are available within and around the cell.

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What is a variation needed for a species to evolve?

Answers

A variation that is needed is 
reproduction

Which component of the plasma membrane contains a hydrophobic region and acts as the primary barrier to most foreign substance A) phospholipid

B) cholesterol

C) protein

D) carbohydrate chain

Answers

the correct answer is option A

Phospholipids structure consists of two parts –

a) Hydrophillic Head

b) Hydrophobic tail  

The phospholipids are arranged in two parallel layers thereby forming by the phospholipid bilayer. It is the part of cell membrane and arranges them in a way that their hydrophilic heads face towards the outwards direction and the hydrophobic tails face each other. The hydrophobic tails opposes the transfer of fluid movement specially the water and the fatty acid head containing negative phosphate group opposes the movement of charged ions. They allow transfer of material  under specific circumstances.

Which describes a Mendelian trait?A. Blood type in humans has several
different alleles.
B. Plants can grow to a wide range of
heights.
C. Humans either have attached
earlobes or detached earlobes.
D. Human body mass is controlled by
many genes.

Answers

The Mendelian trait are those controlled at only single gene locus. The Mendelian trait have two alleles (one form each parent), out of which one allele is dominant while the other is recessive. The dominant allele will express in both homozygous and heterozygous conditions while the recessive allele will express itself only in homozygous condition. An example of the human Mendelian trait is the attached or detached earlobes. A human will either have attached earlobe or detached earlobe.

Hence, the correct answer is 'Option C - humans either have attached earlobes or detached earlobes'.

The correct answer is C. (Ik it's correct because I just answered it)

A relationship between two species that benefits both species would be described as what type of relationshipmutualism
communication
commensalism
parasitism

Answers

It is called mutualism because it is mutually beneficial.

Evolution of the spindle was of central importance to eukaryotic cells. what role is played by the spindle during mitosis?

Answers

The role played by the spindle during mitosis is to bring about an orderly distribution of chromosomes to the daughter cell. 
The spindle fibers form a protein structure that divides the genetic material in a cell. They are necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: in both mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle. 
Thespindle fibers are important in theseparation of sister chromatids of the chromosomes, at the centromere. This occurs during metaphase toanaphase. The spindle is composed ofmicrotubules. They extend from the poles of the cell and attach to thekinetochore (at the centromere) of the chromosomes and start pulling apart




A recent study has shown an increase in the number of predators in an ecosystem. Which of the following is not a possible cause for the growth?

Answers

one of the following that is not a possible cause for the growth is  B

An increase in the population of prey it feeds on.