Biology

A scientist introduces a mutation into the gene responsible for producing melanin, a pigment protein in skin cells What might be a potential effect of this mutation on the organism? Abnormal skin coloration or increased sensitivity to sunlight Faster rate of bone growth Increased production of antibodies Enhanced ability to regulate body temperature

Which of the following questions explores the relationship between DNA and the instructions for cells? What are the steps involved in DNA replication? How does the amount of DNA differ between different organisms? How does the sequence of nucleotides in DNA specify the sequence of amino acids in a protein? Where is DNA located within the cell?

__ are ions in the blood that help regulate fluid balance Micronutrients Myoglobins Electrolytes Antioxidants

Consider a protein that functions as an enzyme Its specific three -dimensional shape includes an active site that binds to a particular substrate. If the gene coding for this enzyme has a mutation that changes the amino acid sequence, what is the most likely consequence for the enzyme's function? The enzyme will be produced at a faster rate. The enzyme will be transported jo a different location in the cell. The shape of the active site may change affecting its ability to bind to the substrate. The enzyme will start to break down different types of molecules.

If a cell has a damaged DNA molecule that cannot be repaired, what might be a possible consequence related to cell division? The cell will immediately undergo meiosis. The cell might continue to divide uncontrollably, leading to abnormal cell growth. The cell will differentiate into a more specialized type of cell. The rate of protein synthesis in the cell will increase.

onsider the levels of organization in the human body: cells (muscle cells), tissues (muscle ssue), organs (heart)and organ systems (circulatory system)Which statement best escribes the relationship between these levels? Simpler levels are built upon to create more complex levels with specialized functions. More complex levels directly control the functions of simpler levels without interaction. The levels are randomly arranged and do not have a specific organizational pattern. Each level functions independently of the others.

During cel division (mitosis), the genetic material is duplicated and then divided between two daughter cells. What is the primary reason for this duplication and of genetic material? To ensure that each new cell has a complete set of chromosomes. To eliminate any damaged or mutated DNA. To increase the genetic diversity of the organism. To allow for the specialization of cells through differentiation.

What is happening to Freak's body? Freak is too big for his age. Freak keeps growing on the inside but not the outside. Freak's legs are too small to support his body.

A predator can increase the numbers of certain species in its habitat by A killing and eating the competitors of other species. B living symbiotically with other species. C avoiding certain prey species. D crowding out the species it does not eat.

Though we know that the hippocampus plays a role in learning and memory, the mechanisms by which it works are still not fully understood. In one study, adult mice that ran on a wheel after having a particular experience were more likely to behave as if they had forgotten that experienc than were mice that had the same experience but didn't exercise afterward. The researchers believe that this forgetting was caused in part by neurogenesis in the hippocam pus. This finding may seem to contradict the findings of other studies which suggest that the development of new brain cells in the hippocampus is beneficial to the encoding of memories. But the researchers behind the mouse experiment address this apparent paradox by noting that degrading or remodeling existing memories may actually be a key part of learning, as it could free up the brain to store new information. What is the meaning of neurogenesis as used in the passage? the creation of neurons the specialization of neurons the deterioration of neurons the consolidation of neurons