Archive day

November 13, 2025

3,408 public questions were asked on this day.

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What was Friedrich Miescher's contribution to the discovery of the genetic code? He created the first photograph of the structure of DNA. He discovered how the DNA bases pair together. He created the first accurate model...
Asked by kelvin calin 1 answer
Which is an arrangement of genes consisting of an operator, a promoter, and a repressor? RNA polymerase anticodon codon operon
Asked by kelvin calin 1 answer
Seema knows the mass of a basketball. What other information is needed to find the ball’s potential energy? the volume and height the ball reaches the volume and shape of the ball acceleration due to gravity and the heig...
Asked by wholemelt 1 answer
A forensic scientist is trying to find out the number of adenine bases in the DNA sample that he obtained from a crime scene. What can he assume about the number of adenine? The number of adenine bases will be equal to t...
Asked by kelvin calin 1 answer
An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have? some shielding required positive or negative charge low penetrating power no charge
Asked by wholemelt 1 answer
James is working with the lac operon of Escherichia coli (E. coli). He places the bacteria on a plate of growth media. The lac Operon of E. coli is shown. Based on the current understanding of this operon, which hypothes...
Asked by kelvin calin 1 answer
There was a woman among us, a certain Mrs. Schächter. She was in her fifties and her ten-year-old son was with her, crouched in a corner. Her husband and two older sons had been deported with the first transport, by mist...
Asked by j 1 answer
Which of these is the primary site of protein synthesis? mitochondria cytoplasm nucleus ribosomes
Asked by kelvin calin 1 answer
Which of the following correctly organizes these genetic terms in order from smallest to largest? chromosome, gene, nucleotide, DNA molecule nucleotide, gene, DNA molecule, chromosome DNA molecule, nucleotide, gene, chro...
Asked by kelvin calin 1 answer
Compare and contrast savannas and grasslands.
Asked by bob 1 answer
Which best matches a type of genetic material with its description? Nucleotides form a helical structure that is called a gene. Genes combine to form structures called nucleotides. Chromosomes create genes. DNA is locate...
Asked by kelvin calin 1 answer
Maria is concerned because she has been exposed to a small amount of radiation during an X-ray. What is her doctor most likely to tell her? Radiations from X-rays is not a mutagen. Mutagens have no effect on the body unl...
Asked by kelvin calin 1 answer
How have savanna plants adapted to long periods of drought?
Asked by bob 1 answer
Consider the incomplete equation below mc020-1.jpg If this equation was completed, which statement would it best support? Nuclear fusion produces elements that are heavier than helium. Nuclear fusion produces elements th...
Asked by wholemelt 1 answer
What must occur for protein translation to begin? A water molecule must be added to the protein chain. A peptide bond must form between subunits of mRNA. The amino acid Cys must be picked up by tRNA. The codon AUG must b...
Asked by kelvin calin 1 answer
Which of the following is not a savanna? a. Cerrado b. Pampas c. Llanos d. Serengeti
Asked by bob 1 answer
What can a person do to limit exposure to X-rays? wear sunblock avoid cigarette smoke wear a protective lead vest avoid chemicals
Asked by kelvin calin 1 answer
A fusion reaction takes place between carbon and another element. Neutrons are released, and a different element is formed. The different element is lighter than helium. heavier than helium. used for energy on Earth. rad...
Asked by wholemelt 1 answer
What is Hindbad most motivated by in this passage? fatigue and curiosity discomfort and peace work and pleasure hunger and greed
Asked by j 1 answer
Elisha is a photographer and charges a set fee to photograph weddings. This is an example of _____ income. a. capital gains b. earned c. hourly d. passive
Asked by julie 1 answer
What characteristics does the serval have that make it well-suited to life on the savanna?
Asked by bob 1 answer
Human rights versus property rights. That argument goes on today as, for example, we debate how closely to regulate coal mining. Is it best to let owners set rules, which is likely to give all of us cheaper coal, or to h...
Asked by p 1 answer
For fitness partners, it is always better to pair an expert with a beginner when they are working on the same task. (1 point) True False
Asked by noclue 1 answer
Why are burrowing animals and ground-dwelling birds common in grasslands?
Asked by bob 1 answer
Human rights versus property rights. That argument goes on today as, for example, we debate how closely to regulate coal mining. Is it best to let owners set rules, which is likely to give all of us cheaper coal, or to h...
Asked by p 1 answer