Answer the following question given this paragraph: Significant figures are all of the digits that can be known with certainty in a measurement plus an estimated last digit. Significant figures provide a system to keep track of the limits of the original measurement. To record a measurement, you must write down all the digits actually measured, including measurements of zero, and you must not write down any digit not measured. The only real difficulty with this system is that zeros are sometimes used as measured digits, while other times they are used to locate the decimal point. Q: What are all of the digits that can be known with certainty in a measurement plus an estimatied last digit called? Choices: - determined figures - important figures - miniature figures - significant figures A:
significant figures
(Question)
Answer the following question given this paragraph: Reverse transcription is the transfer of information from RNA to DNA. The is the reverse of normal transcription. Reverse transcription occurs in retroviruses, such as HIV, the virus that causes AIDS. Retroviruses are RNA viruses that are duplicated in a host cell by using reverse transcriptase enzyme to produce DNA from its RNA genome. Q: What is the transfer of information from rna to dna called? Choices: - confront transcription - forward transcription - reverse differentiation - reverse transcription A:
(Answer)
reverse transcription
Ques: Answer the following question given this paragraph: Q: The binding of what helps eliminate antigens by phagocytosis and complement-mediated lysis Choices: - proteins - amino acids - fats - antibodies A:
Ans: antibodies
(Q).
Answer the following question given this paragraph: Contact Between Sperm and Oocyte Upon ovulation, the oocyte released by the ovary is swept intoand alongthe uterine tube. Fertilization must occur in the distal uterine tube because an unfertilized oocyte cannot survive the 72-hour journey to the uterus. As you will recall from your study of the oogenesis, this oocyte (specifically a secondary oocyte) is surrounded by two protective layers. The corona radiata is an outer layer of follicular (granulosa) cells that form around a developing oocyte in the ovary and remain with it upon ovulation. The underlying zona pellucida (pellucid = "transparent") is a transparent, but thick, glycoprotein membrane that surrounds the cell's plasma membrane. As it is swept along the distal uterine tube, the oocyte encounters the surviving capacitated sperm, which stream toward it in response to chemical attractants released by the cells of the corona radiata. To reach the oocyte itself, the sperm must penetrate the two protective layers. The sperm first burrow through the cells of the corona radiata. Then, upon contact with the zona pellucida, the sperm bind to receptors in the zona pellucida. This initiates a process called the acrosomal reaction in which the enzyme-filled "cap" of the sperm, called the acrosome, releases its stored digestive enzymes. These enzymes clear a path through the zona pellucida that allows sperm to reach the oocyte. Finally, a single sperm makes contact with sperm-binding receptors on the oocyte's plasma membrane (Figure 28.2). The plasma membrane of that sperm then fuses with the oocyte's plasma membrane, and the head and mid-piece of the "winning" sperm enter the oocyte interior. How do sperm penetrate the corona radiata? Some sperm undergo a spontaneous acrosomal reaction, which is an acrosomal reaction not triggered by contact with the zona pellucida. The digestive enzymes released by this reaction digest the extracellular matrix of the corona radiata. As you can see, the first sperm to reach the oocyte is never the one to fertilize it. Rather,... Q: Upon ovulation, the oocyte released by the ovary is swept into where? Choices: - placental barrier - vas deferens - umbilical cord - uterine tube A:
(A).
uterine tube
Ques:Answer the following question given this paragraph: The majority of mollusks and annelids live in the water or inside hosts. Arthropods are invertebrates that include insects. The majority of arthropods live on land. Q: Where do the majority of arthropods live? Choices: - in hives - in water - in air - on land A:

Ans:on land
Answer the following question given this paragraph: Work is done only if a force is exerted in the direction of motion. If the motion is perpendicular to the force, no work has been done. If the force is at an angle to the motion, then the component of the force in the direction of the motion is used to determine the work done. Q: Work is done only if a force is exerted in the direction of what? Choices: - wind - north - gravity - motion A:
motion