Biology Review

Which of the following is true about the kingdom Bacteria?

• Bacteria are not motile.
• Bacteria have a cell wall.
• Bacteria reproduce sexually.
• Some bacteria have a nucleus.

Which of the following is an example of a homozygous dominant genotype?

• BB
• Bb
• bB
• bb

In natural selection, one variation which is present in ALL members of a population is a called a - 

• genotype
• speciation
• adaptation
• diversity

Fill in the blanks: Proteins are made of different ____________ which are arranged in different orders, or _________________.

• ribosomes, tRNAs
• polymers, monomers
• mRNA, bases
• amino acids, sequences

A change in DNA is called a __________________.

• Nucleotide
• Mutation
• Radiation
• Transcription

What part of DNA holds the genetic information?

• the nitrogenous base
• the ribose sugar
• the phosphodiester bond
• the phosphate

If a homozygous dominant (AA) individual is crossed to a homozygous recessive (aa) individual, what will the genotypes be of the offspring?

• 50% AA, 50% aa
• 25% AA, 50% Aa, 25% aa
• 100% Aa
• 50% AA, 50% Aa

The human body has 23 homologous pairs of chromosomes.  How many chromosomes does a somatic cell have?

• 12
• 23
• 46
• 92

What is meant by the term "genetic variation?"

• Some individuals have the same genes as others
• Some genes are multiplied in tetraploid organisms
• Some chromosomes are longer than others
• Some individuals have different genes than others

How do molecules move during facilitated diffusion?

• With the concentration gradient, using energy
• Against the concentration gradient, without using energy
• With the concentration gradient, without using energy
• Against the concentration gradient, using energy