20. Choose which of the following occurs before the other steps a. The cell prep
ID: 274403 • Letter: 2
Question
20. Choose which of the following occurs before the other steps a. The cell prepares to divide by making additional organelles and protein b. The nucleus divides. Checks to see if the cell is big enough and proper proteins have been made for the synthesis phase c. d. The cell grows and proteins made for synthesis 21. All of the following are true for enzymes EXCEPT a. they are a type of protein b. they speed up a chemical reaction c. they can be reused d. they are the only type of protein 22. A sucrase molecule will act on a a. lactose molecule b. lactase molecule C. suCrose molecule d. sucrase molecule 23. Transcribe: TACGCCATATT a. UUGCGGAUAUU b. ATGCGGTATAA c. AUGCGGUAUAA d. AUGCGGAUAUU 24. In our toothpick-ase activity. our hands representecd a. the enzyme b. the substrate c. the surrounding conditions d. the active site 25. Select the correctly written phrase a. a protein is a segment of DNA that codes for a gene b. a gene is a segment of protein that codes for DNA c. DNA is a segment of a gene that codes for a protein d. a gene is a segment of DNA that codes for a protein 26. What do the ribosomes do? a. translate proteins b. transcribe proteins c. make mRNA d. unzips the DNAExplanation / Answer
20. Phases of cell cycle includes:
A) Gap 1 or G1 phase: Cell grows rapidly. New organelles, proteins are synthesized.
The cell attains a larger size, ribosomes are increased, proteins for division are produced.
G1/S checkpoint checks that all the required materials for division are present.
B) Synthesis or S phase: DNA replication occurs, chromosomes within the nucleus are copied.
C) Gap 2 or G2 phase: Organelles (chloroplast, mitochondria are replicated).
G2/M checkpoint, before mitosis, checks the chromosomes.
Answer: a, d, c, b
21. Basic properties of enzymes:
There are various kinds of other proteins in cells, other than enzymes. These include, hormones, antibodies, transport proteins, storage proteins, structural proteins and messenger proteins.
Answer: d
22. Sucrase is an enzyme whose substrate is sucrose. Sucrase acts on sucrose and convert into glucose and fructose.
Answer: c
23: Transcription is the initial stage of gene expression. A DNA molecule is transcribed to RNA molecule, using enzymes RNA polymerase. During transcription, thymine (T) in DNA, is replaced with uracil (U) in RNA. 3’ to 5’ strand is template. 5’ to 3’ strand is coding strand.
Answer: c
24. In the toothpick-ase activity, the toothpicks represent the substrate and the hand represents the enzyme. The enzyme activity is determined as the number of toothpicks broken at a time interval.
Answer: a
25. A gene represent a segment or part of the genetic material, DNA. DNA on transcription generates mRNA, which contains triplet code, or codon. mRNA is translated to form proteins.
Answer: d
26. Ribosomes are organelles present in cytoplasm of cells. They participate in process of translation and help to synthesize proteins.
Answer: a
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