Which of the following best describes a metaphase chromosome?

a.
a double strand of dna with its nucleosomes wound up once around itself to form a thicker structure

b.
an area in the nucleus of a eukaryotic cell where ribosomes are made from rna and protein

c.
a looped chromatin fiber folded up on itself again

d.
a dna molecule in the process of doubling itself to make another identical one

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine