Ques: Q: The prostate gland secretes a fluid that mixes with sperm to help form what? Read this paragraph and choose the correct option from the provided answers: The prostate gland secretes a fluid that mixes with sperm to help form semen. The prostate gland is located beneath the bladder. Semen is a "milky" liquid that carries sperm through the urethra and out of the body. In addition to sperm cells, semen contains sugars (fructose) which provide energy to the sperm cells, and enzymes and other substances which help the sperm survive. Choices: - testosterone - hormone - urine - semen A:
Ans: semen

Ques: Q: Covalent solids are formed by networks or chains of atoms or molecules held together by what? Read this paragraph and choose the correct option from the provided answers: Covalent Solids Covalent solids are formed by networks or chains of atoms or molecules held together by covalent bonds. A perfect single crystal of a covalent solid is therefore a single giant molecule. For example, the structure of diamond, shown in part (a) in , consists of sp3hybridized carbon atoms, each bonded to four other carbon atoms in a tetrahedral array to create a giant network. The carbon atoms form six-membered rings. Figure 12.19 The Structures of Diamond and Graphite. Choices: - ionic bonds - bail bonds - gravitational bonds - covalent bonds A:
Ans: covalent bonds

Ques: Q: What is the double-membrane structure that constitutes the outermost portion of the nucleus? Read this paragraph and choose the correct option from the provided answers: The Nuclear Envelope The nuclear envelope is a double-membrane structure that constitutes the outermost portion of the nucleus ( Figure 4.11). Both the inner and outer membranes of the nuclear envelope are phospholipid bilayers. The nuclear envelope is punctuated with pores that control the passage of ions, molecules, and RNA between the nucleoplasm and cytoplasm. The nucleoplasm is the semi-solid fluid inside the nucleus, where we find the chromatin and the nucleolus. Chromatin and Chromosomes To understand chromatin, it is helpful to first consider chromosomes. Chromosomes are structures within the nucleus that are made up of DNA, the hereditary material. You may remember that in prokaryotes, DNA is organized into a single circular chromosome. In eukaryotes, chromosomes are linear structures. Every eukaryotic species has a specific number of chromosomes in the nuclei of its body's cells. For example, in humans, the chromosome number is 46, while in fruit flies, it is eight. Chromosomes are only visible and distinguishable from one another when the cell is getting ready to divide. When the cell is in the growth and maintenance phases of its life cycle, proteins are attached to chromosomes, and they resemble an unwound, jumbled bunch of threads. These unwound protein-chromosome complexes are called chromatin ( Figure 4.12); chromatin describes the material that makes up the chromosomes both when condensed and decondensed. Choices: - energy fold - nuclear fold - energy envelope - nuclear envelope A:
Ans: nuclear envelope

Ques: Q: What human traits are controlled by more than one gene? Read this paragraph and choose the correct option from the provided answers: Many human traits are controlled by more than one gene. These traits are called polygenic traits (or characteristics). The alleles of each gene have a minor additive effect on the phenotype. There are many possible combinations of alleles, especially if each gene has multiple alleles. Therefore, a whole continuum of phenotypes is possible. Choices: - mutant traits - autolysis traits - maladaptive traits - polygenic traits A:
Ans:
polygenic traits