After 3 half lives how much of a radioactive substance will remain

1/16

1/4

1/2

1/8

The sequences of DNA that are cut out before transcription are known as exons codons introns promoters

Which amino acid is coded by the mRNA sequence CAU?

Which three substances must be present in mitochondria for the process of aerobic respiration to take place?

Nutrients are produced in a plant's leaves during photosynthesis. How are these nutrients transported from the leaves to the roots for storage?

Which of the following is an inference

Plant cells can synthesize organic molecules and later break them down to extract that energy for performing life processes. These activities require direct interaction between the

Which of the following is a key element of naturalism

Jan noticed that when she put a tomato in water, it sank. When she put an apple in water, it floated. Why did the tomato sink while the apple floated?

an ___organism has different types of cells that are specialized for various functions. (fill in the blank)

What process reshuffles allele combinations between homologous chromosomes? a. genetic recombination b. asexual reproduction c. independent assortment d. mitosis