Correct Answer: B. trophic level

Correct Answer: A. nature of substratum

Correct Answer: D) chromatids

Explanation

The question is asking which statement about the nucleus of a living cell is not true. The options listed are A) chromosomes, B) nucleolus, C) nucicoplasm, D) chromatids (which is the correct answer), and E) ribosome. The nucleus is a membrane-bound organelle found in eukaryotic cells, which contains the genetic material of the cell. It is often referred to as the control center of the cell because it regulates gene expression and DNA replication. Chromosomes are structures found in the nucleus that contain genetic information in the form of DNA. The nucleolus is a region within the nucleus that is responsible for the production of ribosomes. Nucicoplasm refers to the jelly-like substance that makes up the majority of the nucleus. Chromatids are two identical copies of a chromosome that are joined at a point called the centromere. During cell division, chromatids separate and move to opposite poles of the cell. Therefore, statement D is not true of the nucleus because chromatids are not a permanent feature of the nucleus, but rather a temporary structure that forms during cell division. Ribosomes, on the other hand, are not found in the nucleus but are located in the cytoplasm or attached to the endoplasmic reticulum. They are responsible for protein synthesis. In summary, the nucleus of a living cell contains chromosomes, nucleolus, and nucicoplasm, but does not contain chromatids. Ribosomes are not found in the nucleus.

Correct Answer: A. 50%

Explanation

Dominant alleles are referred to with capital letters, so let's call the dominant blue-petal allele B. Recessive alleles are referred to using lower case letters, so we will call the recessive white-petal allele b. A heterozygous organism has one dominant and one recessive allele, so the heterozygous flower has one B allele and one b allele. Its genotype is Bb. Because B is dominant to b, its phenotype (the trait produced by its genotype) is blue petals. A homozygous organism has two of the same allele. The homozygous flower will either have two BB alleles or two bb alleles. The question states that the flower with white petals is homozygous recessive, so its genotype is bb and its phenotype is white petals. The only genotype that produces a white phenotype is bb, because you need two recessive alleles in order to express the recessive trait. When you cross the two flowers, each parent donates one of its two alleles for petal color to the offspring. Accounting for every possible combination of alleles from each parent, there are four possible outcomes from a cross between Bb and bb: Bb, Bb, bb, and bb. (It may also help to draw a punnet square to visualize the four possible combinations). As you can see, these outcomes lead to two possible genotypes: Bb and bb. The Bb genotype produces flowers with blue petals, and the bb genotype leads to flowers with white petals. Because two of the four possible outcomes are genotype bb, two of the four possible outcomes are for flowers with white petals. Two out of four is equal to 50%, so 50% is the correct answer.

Correct Answer: B. sex-linked

Correct Answer: B) Animals, protists and carnivorous plants

Explanation

Holozoic nutrition is a type of nutrition that involves the ingestion of whole food materials into the body and their subsequent breakdown into smaller molecules by the digestive system for absorption. This process is seen in animals and some protists. In this question, we are asked to identify the organisms that exhibit holozoic nutrition. The correct option is B, which states that animals, protists, and carnivorous plants exhibit holozoic nutrition. Option A is incorrect as protists are not included. Option C is incorrect as fungi are not included. Option D is incorrect as carnivorous plants are not included. It is important to note that holozoic nutrition is different from other types of nutrition such as autotrophic and saprophytic nutrition. Autotrophic nutrition involves the synthesis of food molecules by organisms using inorganic substances and energy from sunlight, while saprophytic nutrition involves the breakdown of dead organic matter by organisms.

Correct Answer: A. plants is indefinite

Explanation

Growth in plants is indefinite: Unlike animals, which typically have a determinate growth, many plants exhibit indeterminate growth, especially in their early stages of life. Indeterminate growth means that plants can continue to grow throughout their lives, adding new tissues and expanding in size as long as favorable conditions are present.

Correct Answer: A. glucose

Correct Answer: D) liver

Explanation

This question is asking which organ in the body is responsible for the process of deamination of proteins. Deamination is the removal of an amine group from a molecule. Among the options given, the correct answer is the liver. The liver is the largest glandular organ in the body and is responsible for many important metabolic functions. One of these functions is the processing of proteins. The liver breaks down proteins into their component amino acids, and then removes the amine group from each amino acid in a process called deamination. The amine group is converted into ammonia, which is then converted into urea and excreted from the body through the kidneys in the form of urine. The other options listed, such as the lung, stomach, kidney, and heart, do not play a significant role in the deamination of proteins. The lung is involved in respiration, the stomach in digestion, the kidney in filtration and excretion of waste products, and the heart in circulation of blood. In summary, the liver is the organ associated with deamination of proteins in the body. It breaks down proteins into their component amino acids and removes the amine group through the process of deamination.

Correct Answer: B. Spiracle