Which layer of soil is least likely to be penetrated by plant roots?

a.

O (organic matter)

b.

A (topsoil)

c.

B (subsoil)

d.

C (parent rock)

What is a pseudopod?

Which statement best describes vestigial structures A. All animals have them B. They are necessary for an organisms survival C. They contain genetic mutations D. They may have had an important function in the past.

What did watson and crick win due to their discovery of the structure of dna?

Which describes where fog forms? (A) at the ground (B) in the upper atmosphere (C) where the air has very low humidity (D) where the atmosphere contains few particles

If you were looking for the beginning of a gene in a DNA sequence, you would look for the sequence that codes for the start codon, AUG. What is the DNA complement to the start codon? A. TAC B. ATG C. UAC D. AUG

The pedigree chart below shows the individuals in a family who exhibit a certain trait. Based on the information in the chart, what conclusions can be drawn? A diagram of a pedigree chart.

If the allele frequency of the HbS allele is 0.3 in a population, what is the frequency of the HbA allele (assuming this is a two-allele system) ?

How do the nucleotides in dna pair?

Which of the following describes how the septum in the heart affects blood flow? a.) It pumps blood out of the heart to the rest of the cardiovascular system when heart muscles contract. b.

Ethanol is a fuel that can be made from corn. One of the benefits of using a biomass fuel like ethanol is A. It can only be used to power certain types of machines. B. It is a nonrenewable resource. C. It is a renewable resource. D.