VCE Biology Question Thread

[Jason12]

still a bit confused with haploid and diploid. It says diploid contains 2 whole sets of chromosomes (2N) but how much is one set? Is it 22 chromosomes in a set?

[grannysmith]

still a bit confused with haploid and diploid. It says diploid contains 2 whole sets of chromosomes (2N) but how much is one set? Is it 22 chromosomes in a set?

In humans, haploid is 23 and diploid is 46. So 23 in one set (N).

[Reus]

Does anyone know how much of neurons we need to know?

[Rishi97]

Aerobic respiration results in the production of ATP. In aerobic respiration, pyruvate:
a) passes through the outer membrane of the mitochondria
b) is a product of the ETC reactions
c) is a reactant of the glycolysis reactions
d) enters the Krebs cycle unchanged

Sorry for the noob question... forgetting the basics

[walkec]

Is there any difference between DNA profiling and DNA sequencing?

And are co dominance and incomplete dominance the same thing?

[grannysmith]

Is there any difference between DNA profiling and DNA sequencing?

And are co dominance and incomplete dominance the same thing?

DNA profiling is a means of comparing individuals and determining whether or not they are related. It usually uses Short Tandem Repeats (STRs) which are repeated sequences of hypervariable, non-coding DNA. However, DNA sequencing is used to determine the exact order of bases of DNA. So this could be like using probes to determine the specific base sequence of target DNA.

Co dominance occurs when two different alleles are equally dominant and thus equally and independently expressed in the phenotype, whereas incomplete dominance results in an intermediate form of the two alleles.
However, we need not know about incomplete dominance.

Aerobic respiration results in the production of ATP. In aerobic respiration, pyruvate:
a) passes through the outer membrane of the mitochondria
b) is a product of the ETC reactions
c) is a reactant of the glycolysis reactions
d) enters the Krebs cycle unchanged

Sorry for the noob question... forgetting the basics

A) as pyruvate is a product of glycolysis, which occurs in the cytosol, and is a reactant of the Krebs cycle, which occurs in the mitochondrial matrix. It is first converted into Acetyl co-A before entering the Krebs cycle.

[howlingwisdom]

And are co dominance and incomplete dominance the same thing?

Co-dominance is when both alleles are expressed equally in the phenotype of a heterozygous (such as in blood types) whereas incomplete dominance is when the partial effects of both alleles are seen in the phenotype of a heterozygote (e.g red and white flower producing a pink flower)

[Rishi97]

what advantage does an animal cell gain by converting pyruvate to lactic acid? Explain

[grannysmith]

what advantage does an animal cell gain by converting pyruvate to lactic acid? Explain

Generates NAD+ from NADH to be used in glycolysis. A buildup of NADH slows down the rate of glycolysis.

[DJA]

Is the enzyme's active site a function of the polypeptide's tertiary or secondary structure??

Thank you in advance!

[Rishi97]

Is the enzyme's active site a function of the polypeptide's tertiary or secondary structure??

Thank you in advance!

Tertiary structure

[Reus]

Is the enzyme's active site a function of the polypeptide's tertiary or secondary structure??

Thank you in advance!

Tertiary!

EDIT: Rishi beat me to itttttt

[dankfrank420]

In cellular respiration, isn't NADH and NAD+ the same thing?

[grannysmith]

NAD+ is unloaded, NADH is loaded

[shivaji]

What are the disadvantages of rational drug design?