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3 years ago

Which of these is a major function of RNA?

Biology

2 answers:

ella [17]3 years ago

8 0

RNA stands for ribonucleic acid. It's primary function is to make ribosomes, hence the answer is 'a'

loris [4]3 years ago

6 0

It depends on the type of RNA but I would say b, because RNA is basically a copy of parts of DNA containing information for synthesis of a chain of amino acids (sorry for bad English I hope you get what I mean)

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(a) if the seawater carbonate ion concentration is 270 ?mol/kg, what is the approximate rate of calcification, and approximately

Travka [436]

Using the graph provided with the question, we are able to find that that for a concentration of 270 micromol per kilogram, the calcification rate is 20 mmol calcium carbonate per meter squared per day.

Using this calcification rate,
30 = 20 * 1 * days

days = 1.5

The deposition will require 1.5 days.

7 0

3 years ago

The process of cellular respiration can be represented by the chemical formula

Mandarinka [93]

Answer:

Explanation:

The correct formula for cellular respiration is:

Glucose (sugar) + Oxygen → Carbon dioxide + Water + Energy (as ATP).

7 0

3 years ago

Use the mechanisms of meiosis to explain why most mules are sterile.

Tema [17]

Answer:

3. An even number of chromosomes are required for synapsis during prophase I and proper pairing during metaphase

Explanation:

Mules are hybrids of a cross between a female horse and a male donkey. Horses contain 64 chromosomes while donkeys contain 63 chromosomes in their somatic cells respectively. This means that they each produce 32 and 31 chromosomes respectively during meiosis. A mule, hence, contains 32+31= 63 chromosomes in their somatic cells.

This chromosome number in mules are uneven for meiosis to occur because meiotic division requires that an even number of homologous chromosomes pair together in a process called SYNAPSIS during prophase I of meiosis I. This is impossible in a mule because of the uneven number of chromosomes in its cells.

Also, during metaphase of meiosis, the homologous chromosomes need to be properly aligned at the equator for separation to occur. This is also impossible in a mule considering the number of chromosomes that don't add up.

Due to this reason of unevenness in the number of chromosomes present in a mule, meiosis will not occur and if meiosis (gamete formation) does not occur, reproduction cannot take place. Therefore, the mule is a sterile species i.e. cannot produce offsprings via sexual reproduction.

4 0

3 years ago

Human blood type is determined by three alleles IA, IB, and IO. The alleles IA and IB are co-dominant to each other, and both ar

dlinn [17]

Explanation:

According to p²+q²+2pq=1 (Hardy-Weinberg equilibrium)

heterozygote allele will be always 2pq

<u>1. Population</u>

1. A blood group has two genotypes- IAIA and IAIO

The genotype frequency will be-

IAIA= 0.3 X 0.3 = 0.9

IAIO= (0.3 x 0.6) x 2= 0.36

Total genotype frequency = 0.9+ 0.36 =0.45 or 45%

Now 45% of 540,000= 2,43000 (A blood group)

2. B blood group has two genotypes- IAIB and IBIO

The genotype frequency will be-

IBIB= 0.1 x 0.1 = 0.1

IBIO= (0.1 x 0.6)-=0.12

Total genotype frequncy= 0.13 or 13%

popluation with B blood group= 13% of 540,000 will be 70,200

3. AB blood group is IAIB

2 x IAIB= (0.3 x 0.1) x 2= 0.6

popluation with B blood group= 6% of 540,000= 32,400

4. O blood group

2. Heterozygote

IBIO blood group

= (0.1 x 0.6) x 2

= 0.12 or 12%

= 12%

4 0

3 years ago

To reproduce , female elephants produce eggs and male elephants produce sperm. Off spring are produced by the fusion of an egg w

Pie

Answer:

Answer: C. The offspring are genetically distinct from the parents because they are produced by sexual reproduction. Explanation: Sexual reproduction occurs through the fusion between an egg and a sperm cell

8 0

3 years ago