During which stage of meiosis does crossing over usually occur?

A. Prophase I

B. Metaphase I

C. Prophase II

D. Metaphase II

Which of the following monomers would be used to make the double helix of DNA molecule

When the body needs to conserve water, the kidneys excrete a hypertonic urine. what do the terms isotonic and hypertonic mean?

BONUS: You have a DNA sequence that codes for a protein and is 105 nucleotides long. A frameshift mutation occurs at the 85th base - how many amino acids will be correct in this protein? SHOW YOUR WORK.

Where in the skeleton is the ulna located in reference to the humerus?

Which of the following organisms is a heterotroph? A. mushroom B. alga C. wheat D. sunflower

Name the two energy-equivalent molecules that contain three phosphates as part of their structure. what makes these two molecules different? how many high energy phosphate bonds do they contain? nutrition

During what period of time has the sunbelt region of the u. s. grown most quickly?

The axial skeleton includes the A) vertebra, skull, and ribs B) hip bones, knees, and feet C) shoulder bones, elbows, and hands D) bones of the fingers and toes

After transcription, nuclear RNA is capped, polyadenylated, spliced. After successful splicing, proteins are added to the mature mRNA at the exon junction complex and then transported to the cytoplasm.

How would you distinguish adaptations and variations for a younger student?