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Lilit [14]
3 years ago
14

Ribosomal RNA is produced by _____. lysosomes nucleoli mitochondria Golgi bodies

Biology
2 answers:
alina1380 [7]3 years ago
3 0
B.) <span>Ribosomal RNA is produced by "Nucleoli"

Hope this helps!</span>
Phantasy [73]3 years ago
3 0
Hi Kenxie

The correct option is : B

Nucleoli


I hope that's help ! 

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If the integument of an angiosperm seed contains cells with 20 chromosomes, how many chromosomes would you expect to find in the
OleMash [197]

Answer:

30

Explanation:

The seed of an angiosperm is formed as a result of fertilization (fusion of sperm in pollens and the ova from ovary). According to the question, the cells of the seed which will grow into the plant contains 20 chromosomes. Seeds of angiosperms contain a tissue called ENDOSPERM that forms as a result of the unique DOUBLE FERTILIZATION in angiosperms. It occurs when one haploid sperm cell fuses with two haploid polar nuclei to form a triploid endospermic structure that serves as food for the growing embryo in the seed.

Now based on the above explanation, the diploid plant cell with 20 chromosomes will have 10 chromosomes (half as much) in its gametes as a result of meiosis. This 10 chromosomes in each gamete (sperm and ovum) fuses to form a diploid zygote with 20 chromosomes, while one haploid sperm cell (10 chromosomes) also fuses with two haploid polar nuclei (10 chromosomes each) to form a triploid endosperm with 30 chromosomes i.e. 10+10+10.

8 0
3 years ago
Why heart disease is not an infectious disease?<br><br><br> I need help please
Sidana [21]

Answer:

The old idea that coronary heart disease is an infectious disease has gained popularity in recent years, and both viral and bacterial pathogens have been proposed to be associated with the inflammatory changes seen in atherosclerosis. Herpes group viruses, notably cytomegalovirus and herpes simplex type 1, have been associated with atherosclerosis and restenosis. Helicobacter pylori and dental infections have also been linked to atherogenesis, but the evidence seems to favor a respiratory, obligatory intracellular bacterium, Chlamydia pneumoniae. The association was originally found in seroepidemiological studies, but the actual presence of the pathogen in atherosclerotic lesions has been repeatedly demonstrated, and during past year the first successful animal experiments and encouraging preliminary intervention studies were published. The causal relationship has not yet been proven, but ongoing large intervention trials and continuing research on pathogenetic mechanisms may lead to the use of antimicrobial agents in the treatment of coronary heart disease in the future.

Explanation:

© 1998 Lippincott Williams & Wilkins, Inc.

7 0
3 years ago
Which best describes crossing over? a it occurs during mitosis and reduces the chances of genetic variation in organisms. b it o
WINSTONCH [101]
<span>it occurs during meiosis and increases the chances of genetic variation in organisms</span>
7 0
3 years ago
Large cells have more volume on the inside and less space on the outside. (Compared to a smaller cell) Because of this, large ce
7nadin3 [17]
C) moving materials in and waste products out
7 0
3 years ago
What explains the functional versatility of rna molecules?
Ierofanga [76]
Hello there buddy,

<span>RNA is able to hydrogen bond with water (otherwise it wouldn't be soluble), but since water is small and prefers to be able to move around freely, these hydrogen bonds are quite unstable. For that reason, RNA forms much more stable bonds with larger, compatible molecules. Among those, different RNA molecules may bind to DNA or proteins to serve some function, while they can also bind complementary strands of RNA.
</span>
I hope this helps you!

~Jurgen
4 0
3 years ago
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