BIOL Exam 3

What are the parts of a nucleotide?

• A phosphate group only

• A nitrogenous base and a sugar only

• A sugar, a phosphate group, and a nitrogenous base

• Two sugars and one phosphate group

Transcription of a DNA molecule with a nucleotide sequence of AAA-CAA-CTT results in an mRNA molecule with the complementary sequence of what?

• AAA-CAA-CTT

• TTT-GTT-GAA

• UUU-GUU-GAA

• UUA-CAA-CUU

What happens during translation?

• DNA is copied into RNA inside the nucleus

• Ribosomes read mRNA codons and assemble a polypeptide from amino acids

• Chromosomes are duplicated prior to cell division

• mRNA is edited by removal of introns and addition of a poly-A tail

During which stage of meiosis does crossing-over occur?

• Prophase I

• Metaphase I

• Anaphase II

• Telophase I

Why is crossing-over important?

• It ensures chromosomes separate equally

• It increases genetic variation by exchanging DNA between homologous chromosomes

• It repairs DNA damage during replication

• It prevents nondisjunction in meiosis II

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

A(n) _____ is a group of three bases on tRNA that is complementary to a specific mRNA codon.

• Codon

• Anticodon

• Promoter

• Exon

Tags

NGSS.HS-LS1-1

If a DNA sample contains 37% adenine, what percentage of the sample contains cytosine?

• 37%

• 26%

• 13%

• 50%

The offspring of a monohybrid testcross could have what possible genotype(s)?

• AA only

• Aa and aa

• Aa only

• aa only

If two parents have blood genotypes IAi and IBi, what blood genotypes are possible in their children?

• IAIB

• IAi

• IBi

• ii

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

If a pea plant shows a recessive phenotype, what has to be the genotype?

• AA

• Aa

• aa

• AA or Aa