1. If the hydrogen ion concentration of ammonia is 0.00000000001 mol/L, then wha

Question

1. If the hydrogen ion concentration of ammonia is 0.00000000001 mol/L, then what is its pH value?

10

-10

1

-11

11

2. If an allele is dominant, then:

one allele can mask the expression of a recessive allele in a hybrid.

its phenotype is more beneficial than the recessive phenotype.

its phenotype is always expressed in all generations.

its phenotype is only expressed in heterozygous individuals.

its phenotype is expressed only in homozygous individuals..

3. How many times do G protein–linked receptors loop back and forth through the plasma membrane?

once

twice

three

seven

eleven

4. In eukaryotes, the initiator tRNA carries the amino acid leucine.

__________________

True

False

5. In fungi and protists, gametes produced by ____ of haploid cells fuse to form a ____ zygote, which then undergoes ____ to restore the haploid chromosome number.

mitosis, diploid, mitosis

mitosis, haploid, meiosis

mitosis, diploid, meiosis

meiosis, haploid, mitosis

meiosis, diploid, mitosis

10

-10

1

-11

11

Explanation / Answer

Answer.

1. E. 11

Explanation.

pH=7 (neutral): [H+] = 10-7M = 0.0000001 mol/l

pH=1 (acidic): [H+] = 10^-1M = 0.1 mol/l

pH=13(alkaline): [H+] = 10-^13M = 0.0000000000001 mol/l

pH = 11 (alkaline): (H+)= 10^-11M = 0.0000000001

2). a. one allele can mask the expression of a recessive allele in a hybrid

Explanation.

Dominant allele masks the expression of receive allele and dominant phenotype appears both in homozygous (AA) and heterozygous conditions (Aa).

3). D. Seven

Explanation.

G protein-linked receptors are a large family of transmembrane proteins that loop back and forth through the plasma membrane seven times.

4). False

Explanation.

Initiator tRNA carries amino acid methionine

5).c. mitosis, haploid, meiosis

Explanation.

Fungi and protists are haploids. Haploid cells always undergo mitosis only. When the haploid gametes are fused, diploid zygote will be produced. Zygote undergoes meiosis to produce haploid plant body there by restoring chromosome number.

.

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