In the Krebs cycle, how is citric acid formed? A. Pyruvic acid molecules are broken down by an acetyl group.
B. Carbon dioxide bonds with a chain of coenzyme A.
B. Enzymes combine hydrogen ions, oxygen, and electrons.
D. Acetyl-CoA joins with a large molecule called oxaloacetic acid.

Coat color in cats is determined by genes at several different loci. at one locus on the x chromosome, one allele (x ) encodes black fur and another allele (xo) encodes orange fur. females can be black (x x ), orange (xoxo), or a mixture of orange and black called tortoiseshell (x xo). males are either black (x y) or orange (xoy). bill has a female tortoiseshell cat named patches. one night, patches escapes from bill\'s house, spends the night out, and mates with a stray male. patches later gives birth to the following kittens: one orange male, one black male, two tortoiseshell females, and one orange female. what are the genotypes of patches, the stray male, and the kittens?

Diabetes is often suspected when glucose shows up in urine tests. use the model to explain how glucose could be present in urine. why do you think this symptom is especially concerning for young people?

Which type of stimulus do mechanoreceptors detect? sound pain heat light