Biology Topics that we cover

Ch.1 - Introduction to Biology

Ch.4 - Carbon

Ch.19 - Viruses

Ch.21 - Genomics

Ch.23 - Evolution by Natural Selection

Ch.25 - Speciation

Ch.26 - History of Life on Earth

Ch.27 - Phylogeny

Ch.32 - Overview of Animals

Ch.36 - Vascular Plant Transport

Ch.38 - Plant Reproduction

Ch.44 - Osmoregulation and Excretion

Ch.45 - Endocrine System

Ch.46 - Animal Reproduction

Ch.48 - Sensory Systems

Ch.49 - Muscle Systems

Ch.50 - Ecology

Ch.51 - Animal Behavior

Ch.52 - Population Ecology

Ch.54 - Ecosystems

Ch.55 - Conservation Biology

Latest Biology Questions

Popular Biology Practice Problems

Cellular respiration catabolizes food molecules to produce ATP. A glucose molecule was imported into the cytosol of a human cell. Which catabolic process can this glucose molecule immediately enter?

A. Pyruvate Oxidation

B. Glycolyis

C. The Krebs cycle

D. Electron Transport Chain

E. Alcohol Fermentation

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The expression of lac operon in an E. coli cell missing the gene that encodes for the lac repressor will:

A. increase when lactose is present.

B. decrease when lactose is present.

C. decrease when glucose is present.

D. increase when glucose is present.

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Which statement explains what aerobes use oxygen to do?

A. to provide the alcohol group added to organic compounds in fermentation

B. to insulate themselves in anaerobic environments

C. to oxidize organic compounds for the release of energy and/or as a terminal electron acceptor

D. to prevent free radicals from reacting with DNA and other vital molecules

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I am raising a populationof Halloween cats - they have either black tails or orange tails. tail color is determined by a single gene with only two alleles: B is for a black tail and black is dominant; b represents the allele for the recessive trait, an orange tail.In a population of 200 cats, 32 of the cats have an orange tail. Assuming Hardy-Weinberg equilibrium, what is the frequency of homozygous recessive individuals in the population?

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In rabbits, the allele of the gene for short hair (S) is dominant over the allele for long hair (s) and the black hair (B) is dominant over brown hair (b). The hair color and hair length genes are on separate pairs of chromosomes. For a cross between a SsBb and a ssBb rabbit, what are the expected genotypes and phenotypes in the offspring?

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