4/15 Science Assessment

1. A DNA molecule is being transcribed onto a RNA molecule. The next base to be transcribed on the DNA sequence is adenine. Which base will be complements in the RNA molecule?

A. uracil

B. adenine

c.thymine

d. guanine

2. Which nucleic acids are present in both RNA nad DNA?

a. guanine and uracil

b. thymine and uracil

c. guanine and adenine

d. thymine and adenine

3.  A tomato plant has 24 chromosomes in its egg cells. How many chromosomes are founfd in a leaf cell from the same plant?

a. 6 chromosomes

b. 12 chromosomes

c. 24 chromosomes

d. 48 chromosomes

4. The sperm cell of a squirrel ahve 20 chromsomesa . How many chromosomes are found in a body cell of the same animal? a. 10 chromosomes?

a. 10 chromosomes

b. 20 chromosomes

c. 40 chromosomes

d. 80 chromosomes

5. Which statement describes the beginning and the products of meiosis?

a. one diploid cell becomes two haploid cells.

b. One  haploid cell becomes two diploid cells.

c. One diploid cell becomes four haploid cells

d. one haploid cell becomes four diploid cells.

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