Biology Leaving CERT Quiz Questions And Answers

A fox is commonly known as a predator because it is an animal that hunts and feeds on other animals. Foxes have sharp teeth and claws, which they use to catch and kill their prey. They are skilled hunters and have a varied diet that includes small mammals, birds, and insects. Foxes are known for their cunning and stealthy nature, allowing them to sneak up on their prey and catch them by surprise. Overall, the behavior and characteristics of a fox align with the definition of a predator in the animal kingdom.

Ethanol is added at the end of the experiment to extract DNA. Ethanol is a polar solvent that helps to precipitate the DNA molecules out of the solution. When ethanol is added, it causes the DNA to clump together and become visible, making it easier to separate from the rest of the solution. This step is crucial in DNA extraction as it allows researchers to isolate and study the DNA further.

Fertilization occurs in the fallopian tube. After ovulation, the egg is released from the ovary and travels through the fallopian tube. If sperm is present in the fallopian tube, it can fertilize the egg there. The fertilized egg then continues its journey to the uterus, where it implants and develops into a pregnancy. The cervix is the lower part of the uterus and does not play a direct role in fertilization. Progesterone is a hormone involved in the menstrual cycle and pregnancy, but it is not the site of fertilization.

Biceps and triceps are an example of an antagonistic muscle pair because they have opposite actions. The biceps are responsible for flexion at the elbow joint, while the triceps are responsible for extension at the elbow joint. When one muscle contracts, the other relaxes, allowing for smooth and coordinated movement.

A prokaryotic cell is a type of cell that does not have a nucleus. Unlike eukaryotic cells, which have a true nucleus enclosed within a membrane, prokaryotic cells have their genetic material (DNA) floating freely in the cytoplasm. Prokaryotic cells are typically found in organisms such as bacteria and archaea. They are simpler in structure compared to eukaryotic cells and lack membrane-bound organelles such as mitochondria and ribosomes.

The epiglottis is a flap of tissue located at the base of the tongue that prevents substances from entering the lungs. When we swallow, the epiglottis closes off the opening to the trachea, directing food and liquids down the esophagus and into the stomach. This prevents any substances from accidentally entering the lungs, which could lead to choking or respiratory issues.

The correct answer is Krebs Cycle and Electron Transfer System. In Stage 2 of human respiration, the Krebs Cycle, also known as the citric acid cycle, takes place in the mitochondria and involves the breakdown of glucose to produce energy-rich molecules such as ATP. The Electron Transfer System, also known as the electron transport chain, occurs in the inner mitochondrial membrane and involves the transfer of electrons from molecules produced in the Krebs Cycle to generate more ATP. These two stages are essential for the production of energy in the form of ATP during cellular respiration.

Methylene Blue is used when viewing an animal cell through a microscope because it is a commonly used stain in biological laboratories. It helps to enhance the visibility of cellular structures by binding to certain components within the cell, such as DNA and proteins. Methylene Blue stains the cytoplasm, nucleus, and other organelles of the animal cell, allowing them to be easily observed and studied under a microscope.

The statement is false because 'Bb' and 'Tt' are actually heterozygous examples in genetics. Homozygous refers to having two identical alleles for a particular gene, while heterozygous refers to having two different alleles. In this case, 'Bb' and 'Tt' have different alleles ('B' and 'b', 'T' and 't'), making them heterozygous examples.

The pH of the acid in the stomach is 2. The stomach produces hydrochloric acid, which helps in the digestion of food. This acid is highly acidic, with a pH value of around 2. The low pH is necessary for the breakdown of proteins and activation of digestive enzymes. It also helps in killing bacteria and other pathogens that may enter the stomach with food.

A species is a group of organisms who can produce fertile offspring together naturally. This means that the individuals within a species are capable of reproducing and producing offspring that are also capable of reproducing. Fertility refers to the ability to reproduce successfully, so when organisms within a species can produce fertile offspring, it ensures the continuation of that species through successful reproduction.

The correct answer is Systemic and Pulmonary. The human circulatory system consists of two main systems - the systemic circulation and the pulmonary circulation. Systemic circulation is responsible for delivering oxygenated blood from the heart to the body's tissues and organs, while pulmonary circulation transports deoxygenated blood from the heart to the lungs for oxygenation. These two systems work together to ensure the proper distribution of oxygen and nutrients throughout the body and the removal of waste products.

Proteins cannot be filtered in a nephron because the glomerular filtration barrier, which consists of the glomerular capillary endothelium, basement membrane, and podocytes, does not allow large molecules like proteins to pass through. Only small molecules like water, glucose, and amino acids can be filtered through the glomerulus and subsequently reabsorbed or excreted in the renal tubules.

Sperm are stored for up to 6 weeks in the epididymis, which is a tightly coiled tube located on the back of each testicle. The epididymis serves as a storage and maturation site for sperm, allowing them to gain motility and fertilization capacity. From the epididymis, sperm are transported through the vas deferens during ejaculation. The testicles produce sperm, but they are not directly involved in the storage process. The prostate gland, on the other hand, plays a role in semen production but not in sperm storage.

Suitable temperature, water, oxygen, and soil are all necessary for plant growth. Suitable temperature ensures that the plant's metabolic processes can occur at an optimal rate. Water is essential for nutrient uptake and transportation within the plant. Oxygen is required for respiration, which provides energy for plant growth. Soil provides essential nutrients and acts as a medium for root anchorage. However, plants can be grown in aqueous solutions. Sunlight is also necessary for photosynthesis, but it is not listed as an option in the question.