There's 39 chromosomes in the sperm cell. Why? Because sperm cells are gametes and therefore they are haploid cells meaning they have half the number of chromosomes of a regular cell or diploid cell.
78 / 2 = 39
Answer:
The correct answer is "chloroplasts and mitochondria".
Explanation:
Chloroplasts and mitochondria are two essential organelles because of its function of producing Adenosine triphosphate (ATP), the "molecular unit of currency". Chloroplasts are organelles that are found in plants and work in light conditions, whereas mitochondria could produce ATP in the dark. Since the biologist found that the heavier fraction could produce ATP in light it is very likely that it will have chloroplasts, while the light fraction that produces ATP in the dark would likely have mitochondria.
We'll use humans as an example since it's simple and relevant.
All
healthy humans have 46 chromosomes (23 pairs of very similar
chromosomes). When gametes are formed in meiosis, this number is halved,
such that sperm and ovum have only 23 chromosomes (just one of each
pair). When these gametes meet and fuse as a result of sexual
reproduction, the 23 chromosomes from the ovum and the 23 chromosomes
from the sperm combine to form the full set of 46.
Sometimes
meiosis doesn't quite work perfectly, though. Downs Syndrome is an
example of this (one gamete has both copies of chromosome 21, so after
fusion with the other gamete there are 3 chromosome 21s!).
Answer:
cells are regulated by their oxygen uptake
