Questions 1 - 10

Question 0

The lac operon of E. coli is ___________ when the repressor is bound to lactose.

Answer 0

active

Question 1

The phase of mitosis during which the nuclear envelope fragments and the nucleoli disappear is called __________.

Answer 1

Prophase

Question 2

Which of the following statements regarding sexual and asexual reproduction is true?

Answer 2

Sexual reproduction is more likely to increase genetic variation than is asexual reproduction.

Question 3

In a prokaryote, a group of genes with related functions, along with their associated control sequences, defines __________.

Answer 3

an operon

Question 4

Proteins that bind to DNA and turn on operons by making it easier for RNA polymerase to bind to a promoter are called __________.

Answer 4

activators

Question 5

Many genetic disorders of humans are cause by ___________.

Answer 5

recessive alleles

Question 6

All the offspring of a black-eyed Mendelien and an orange-eyed Mendelien have black eyes. This means that the allele for black eyes is _________ to the allele for orange eyes

Answer 6

dominant

Question 7

A gene operon consists of __________.

Answer 7

transcribed genes, a promoter, and a regulatory gene

Question 8

Which of the following statements is false?

Answer 8

incomplete dominance supports the blending hypothesis

Question 9

Which of the following statements is false?

Answer 9

Gametes are made by mitosis

**only somatic cells are made by mitosis; gametes are made by meiosis