6A/ 6G

Multiple Choice

The shape of DNA is called:

• Helix

• Double helix

• Triple helix

• Ladder

Multiple Choice

What is the monomer of DNA?

• Amino acid

• Glucose

• Fatty acid

• Nucleotide

Multiple Choice

What part of the DNA molecules carries the code for specific traits?

• The sequence of nitrogen bases

• Sugar-phosphate backbone

• "Sides" of the ladder

• The phosphate

Multiple Choice

6A: Students are given data from an investigation that identified some of the chemical elements present in four different samples. Which sample was most likely DNA?

• Sample 1

• Sample 2

• Sample 3

• Sample 4

Multiple Choice

In DNA only, Adenine always pairs with:

• Thymine

• Cytosine

• Uracil

• Guanine

Multiple Choice

What is the bond between nitrogen bases?

• Carbon

• Nitrogen

• Hydrogen

• Oxygen

Multiple Choice

6A A segment of a DNA strand is shown.

3’ AGGTCAGGT 5’

Which of these is the correct complementary DNA strand for the segment shown?

• 5’ AGGTCAGGT 3’

• 5’ ACCUGAGGU 3’

• 5’ TGGACTGGA 3’

• 5’ TCCAGTCCA 3’

Multiple Choice

This image shows a photomicrograph of an onion root tip. In what phase of mitosis is the indicated cell?

• Telphase

• Interphase

• Prophase

• Anaphase

Multiple Choice

6G: Which diagram demonstrates how crossing-over contributes to genetic variety during meiosis?

Multiple Choice

A diagram of crossing over in meiosis is shown. What is the significance of crossing over in meiosis?

• Genes in the gametes recombine to increase genetic variation.

• Gametes duplicate and alter the number of chromosomes present at the end of meiosis.

• Gametes begin with 48 chromosomes and still have 48 at the end of meiosis

• Genes replicate and ensure that the offspring have the same traits as the parents.

Multiple Select

Meiosis creates: Select all that apply.

• haploid cells

• diploid cells

• gamete cells

• somatic cells

• different cells

Multiple Choice

6G Human body cells each have 46 chromosomes in their nuclei. Meiosis is necessary in order to ensure that each gamete produced in the human body has —

• 12 chromosomes

• 23 chromosomes

• 46 chromosomes

• 92 chromosomes