Darwin's theory of natural selection applies only to birds. A. True B. False

Having a bent thumb is a recessive trait in humans. The trait is controlled by a single gene. How many recessive alleles must a person have to have a bent thumb?

Cells have _ of enzymes to act as biological catalysts

A dichotomous key is a way of sorting organisms based on A : whether they are unicellular or multicellular B : the types of cells they are made out of C : a series of yes/no questions D : whether organisms are autotrophs or heterotrophs

Which of the following is NOT an immediate effect on the environment due to fossil fuel use? erosion water pollution High costs acid rain

Anna is observing slides of unlabeled organisms. The organisms are unicellular, have delicate glasslike cell walls with sculpturing, and show all the cell organelles, including chloroplasts. Which organism is she observing?

A Cyclops that is resistant to pesticides and has smooth antennae is crossed with one that is heterozygous for both traits. Show the genotypes of the parents.

Why don't car buyers always choose fuel-efficient vehicles, and how can government regulations encourage them to do so?

Why would it have been impossible for Mendel to create heterozygous pea plants with short stems, green seeds, or bumpy pods

You are working with a team of scientists who are investigating the biochemical control system involved in how animals digest fats in their meals.

What is the effect of a high level of hormone in a bud?