BIOLOGY COLLEGE

_____releases carbon dioxide as a waste product. *Chloroplast
O Cytoplasm
Ribosomes
O Mitochondria

Answers

Answer 1
Answer:

Answer:

Mitochondria

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In the process of embryonic development, which stage comes first?A. GastrulaB.BlastocystC.morulaD.Blastocoel
We find DNA on the ___, In every living cell that an organism ownsa. chromosomes b. reproduction c. mitosis
Suppose the human trait for freckles is controlled by a simple dominant and recessive relationship at one locus. Freckles, F, is the dominant allele, and a lack of freckles, f, is the recessive allele. In a college genetics class, the professor takes a tally of students who have freckles and of students with a lack of freckles. In this class of 123 students, 98 have freckles. Calculate the frequency of the dominant allele, F, and the heterozygous genotype Ff. Express the frequencies in decimal form rounded to the nearest thousandth. Assume the class is in hardy-Weinberg equilibrium for this trait.
2. What happens to the spectral lines of a starthat is moving toward Earth?A. The waves spread out, and the frequency ofeach line increases.B. The waves spread out, and the frequency ofeach line decreases.C. The waves compress, and the frequency ofeach line increases.D. The waves compress, and the frequency ofeach line decreases.
Galactosemia is a recessive human disease that is treatable by restricting lactose and glucose in the diet. Susan Smithers and her husband are both heterozygous for the galactosemia gene. If Susan and her husband have four children, what is the probability that: a. none of the four will have galactosemia?b. at least one child will have galactosemia?c. only one child will have galactosemia?d. the first two will have galactosemia and the second two will not?e. two will have galactosemia and two will not, regardless of order?

Which of the following types of cells can directly kill cells and secretes a chemical known as perforin which accomplishes the killing by producing pore-like openings in the membranes of cells?a. Cytotoxic T cells
b. Helper T cells
c. Antibodies
d. Natural killer cells

Answers

Answer:

Cytotoxic T cells

Explanation:

Perforin is the cytosolic protein and upon degranulation forms pores in the target cell. Perforin protein helps in the transport of water and ions.

Perforin is present in the granules of cytotoxic T cells. These cells have the ability to kill virus infected cells and cancer cells. Cytotoxic T cells bind with the class 1 MHC molecules. These cells are also known as CD8+ T cells.

Thus, the correct answer is option (A).

What is one difference between p-waves and s-waves

Answers

p waves travel through solid liquid or gas and s waves travel through solid but is stopped by liquid and gas.

Which of the following statements about tRNA is FALSE? A. tRNAs of both eukaryotes and prokaryotes share common features.
B. The two-dimensional structure of tRNAs exhibits a cloverleaf pattern.
C. tRNAs are produced in the nucleus.
D. functional tRNAs have been spliced by splicesomes.
E. tRNAs possess an anticodon complementary to the codon.

Answers

Answer:

D. functional tRNAs have been spliced by splicesomes.

Explanation:

Functional tRNAs are not spliced by splicesomes, they are trimmed with the help of RNAases instead.

In all tRNAs, RNAase P cuts at 5'end so as to produce a monophosphate because a phosphodiester bond consists of only one phosphate and 2 sugar molecules.

After that 3'end processing occurs in which RNAase II and RNAase D remove extra nucleotide sequences at 3' end. CCA is added at 3' end later on with the help of enzyme named as tRNA nucleotidyltransferase.

So, there is no role of splicesomes only RNAases and other enzymes are involved in tRNA processing.

Final answer:

The false statement about tRNA is that functional tRNAs have been spliced by spliceosomes. tRNA processing involves cleavage and modification, but not with spliceosomes, and this occurs before tRNAs are active in the cytoplasm for protein synthesis. So the correct option is D.

Explanation:

The correct answer to the question "Which of the following statements about tRNA is FALSE?" is D. Functional tRNAs have been spliced by spliceosomes. This statement is false because tRNA processing does not involve spliceosomes, which are specific to mRNA splicing. It is essential to note that, unlike mRNA, tRNA and rRNA are not translated but are involved in protein synthesis in other roles. In eukaryotes, tRNAs are transcribed and processed in the nucleus, but they undergo further processing that includes splicing, methylation, and sometimes nucleotide modification but not by spliceosomes. Following the processing, tRNAs are then exported to the cytoplasm.

tRNA molecules are typically depicted in a two-dimensional cloverleaf pattern, but in three dimensions, they adopt an L-like shape. The molecule is folded due to intramolecular base pairing, creating a structure with an anticodon at one end and an amino acid binding site at the other. Importantly, the anticodon of a tRNA is complementary to the mRNA codon, enabling the tRNA to bring the correct amino acid to the growing polypeptide chain during protein synthesis.

Learn more about tRNA processing,

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What are the two main categories of an ecosystem 5th grade

Answers

Terrestrial/ Land Ecosystems and Aquatic/ocean,water ecosystems

Fructose‑2,6‑bisphosphate is a regulator of both glycolysis and gluconeogenesis for the phosphofructokinase reaction of glycolysis and the fructose‑1,6‑bisphosphatase reaction of gluconeogenesis. In turn, the concentration of fructose‑2,6‑bisphosphate is regulated by many hormones, second messengers, and enzymes. Classify each condition according to its effect on glycolysis and gluconeogenesis Activates glycolysis and inhibits gluconeogenesis Activates gluconeogenesis and inhibits glycolysis

Answers

Answer: Activates glycolysis and inhibits gluconeogenesis

Explanation:

Fructose‑2,6‑bisphosphate coordinates glucose breakdown in glycolysis generates by modulating the action of phosphofructokinase 1 and at the same time inhibits gluconeogenesis.

An interaction between organisms sharing a limited resource where both organisms are harmed.competition


predator-prey

commensalism

mutualism

Answers

Answer:

Competition, A

Explanation: It's not D mutualism is when animals don't gain a lot or anything from each over. You can think of it as mutual the word.

Example of mutualism: The shark has fish on its back eating up all the dead skin on the shark. The shark gains being clean and the fish gain eating food.

Answer:

D

Explanation:
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